Dental device.



i UNITED sTATEs AEATENT oEEr-cE.

WILLIAM S. FILLEY,v OF MONTPELIER, OHIO, ASSIGNOR OF TEN- ELEVENTHS TO JOHN J. SIM, JOHN C. PARNELL, ROBERT B. DIOKERSON, JOHN O. BARGER, JAMES T. @BRYAN-CHARLES M. BOYD, JAMES D. HILL, WILLIAM A. SAUNDERS, H. G. MANN, AND CHESTER W. vBRANNON, OF MONTPELIER, OHIO.

DENTAL DEVICE.

Specification of Letters Patent.

Application filed November 5., 1904. Serial No. 231,529.

To /LZZ whom/15 may concern:

of the bridge without necessitating the removal of the 'abutments The invention consists of a bifurcated.

spring-pinprovided with a detachable spring forming wlngs on opposite sides of the pin and a gasket'tting the pin-shank between the wings and the bifurcated portion of the pin.

The invention also consists in the novel features of construction and combination of parts hereinafter described, pointed out in the claims, and shown in the accompanying drawings, in which- Figurel is adetail elevation of the pin. Fig. 2 is a longitudinal section through the pin on the line 2 2 of Fig. 1. Fig, 3 is a transverse section on the line 33 of Fig. l., Fig. 4 is a vertical section through a root and crown, my device being shown therein in elevation, the section being of the line 4 4 of Fig. 5. Fig. 5 is a section on the line 5 5 of Fig. 4. Fig. 6 is a sectional view similar to Fig. 5, showing a modified form of pin.

In the drawings, A represents the shank portion of a pin flattened and wedge-shaped and having ribs or anges A on opposite edges and a connecting flange or rib A2 at the top of the shank. The ribs A2 are each extended above the upper edge of the shank portion A and form opposing springs A3, which may be curved in a simple or compound curve, as may be desired. A slot AtL is formed in the shank A, and through this slot is passed a leaf-spring B, which is curved upwardly andl outwardlyy upon each side ofthe shank between the flanges Al -and is adapted to be pressed inwardly against the flat faces of the shank and to rest between the opposing Hanges as in a recess or groove.

. gage the recess or undercut J',

vice thus far described as used in connecting a crown to a molar-root. The rootC and crown D are recessed, the recess F of the crown having side walls conforming to the configuration ofthe spring-arms A3 and `enlarged in its upper portion and the recess F of the root elongated or elliptical in horizontal cross-section near the top of the root and wedge-shaped when seen in cross-section as in Fig. 4. When viewed in cross-.section at right angles to the sectional view in Fig. 4, as in Fig. 5, shoulders F2 are noted as being formed adjacent the upper end of the recess F. After the parts are placed in position the recesses F and F' are filled with any suitable cement E. To make a rm smooth union and to prevent acid from substances eaten or from liquids reaching and affecting the cement, I interpose between the crown D and root C a metal gasket K, which rests around the upper end of the shank A, and on each face of the gasket I place a wafer of gutta-percha, thus elfectually sealing the joint against acids likely to injure the cement.

In Fig. 6 I have shown a slightly-modified form of device, in which the root C is joined to a crown D by a pin H, bifurcated at H. This bifurcated portion corresponds to the spring-arms A3 of the preferred form. The crown Dis recessed, the recess J 2 having the conguration of an hour-glass into which the bifurcated spring portion H extends. The root C is recessed, as shown at J, and is undercut on opposite sides, as shown at J The pin .has'lugs H2 on opposite sides, and after being placed in the recess J in a positionat right angles to that shown in Fig. 6 is turned a quarter of a revolution and the lugs H2 enas shownin Fig. 6.

It will be understood that as the pin or shank A is passed into the root the ends of the spring B will lie close to the shank and will spring outwardly when the shoulders F2 are passed, locking the pin in the root. The cement will form a wedge between the springarms A3 and will lock the crown against detachment from the root, while the gasket and guita-percha will make the joint smooth and tig t.

Having thus Jfully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. A dental device comprising` a pin having a flattened shank, flanges 0n the edges of the shank extending above the shank, the said shank being slotted, and a leaf-spring extending through the slot and lying en opposite sides of the shank between the-flanges.

2. A pin comprising a \Ve ;lge-shaped, flattened shank, flanges carried by the edges of the shank and extending above the upper end 01 the shank, a connecting-liange along the upper end of the shank, and a detachable spring forming Wings upon opposite sides oi' the shank.

3. The combination with a root recessed and having undercuts forming shoulders on opposite sides 0f the said recess, and a crownt00th having a recess with inwardly-bulging side Walls, 0l' a pin having' upwardly-extending spring-arms adapted t0 engage the said walls of' the crown-tooth recess, the said pin extending downwardly into the recess of the root, and locking means carried by the pinl adapted to engage the shoulders formed in the root.

4. '.lheeonibination with a recessed root and erown, of a pin having a fianged shank extending into the root, said shan k bei ug slotted a spring passed through the slot and lying upon each side of the shank between the flanges, the root having a shoulder adapted to be engaged by the ends ol the said spring, the llanges extending upwardl)7 into the crown and lorlning spring-arms, a. gasket on the shank between the root and erown, and a gutta-percha wafer on the gasket, as and for the purpose set forth.

NVlLLIAI S. FILLEY.

Witnesses:

D. A. VEBs'rnn, C. C. Dimmi. 

